Is it possible to print odd and even numbers without using global counter in multi-threaded application

Question

With global counter, we can use mutex(for Owning Resource) and Conditional Variable(For Signaling other thread) in multi-threaded application to print odd and even numbers on-by-one.

But How do we achieve same without using global counter?

Answer 1

But How do we achieve same without using global counter?

Why do you need a global counter? A way to wait for and signal the other thread is all you need.

void odd(void *ignore)
{
  for (int j = 1; ; j += 1) {
    printf("%d\n", j);
    // signal other thread
    // wait for it to signal me
  }
}

void even(void *ignore)
{
  for (int j = 2; ; j += 2) {
    // wait for other thread to signal me
    printf("%d\n", j);
    // signal other thread
  }
}